<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <el-alert
                class="war"
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning"
                show-icon>
            </el-alert>

            <span>选择商品分类：</span>
            
            <!-- v-model="selectedCateKeys" 默认返回的是ID -->
            <el-cascader
            v-model="selectedCateKeys" 
            :options="catelist"
            :props="cateProps"
            clearable
            change-on-select 
            @change="handleChange">
            </el-cascader>
            
            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加动态参数按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name">
                        </el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加静态属性的属性 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!--静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag closable v-for="(item,i) in scope.row.attr_vals" :key="i" @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name">
                        </el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        @close="addDialogClosed"
        width="30%">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        @close="editDialogClosed"
        width="30%">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择框双向绑定的数组
            selectedCateKeys: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 被激活的页签页的名称
            activeName: 'many',
            // 动态参数数据
            manyTableData: [],
            // 静态属性数据
            onlyTableData: [],
            // 添加参数和添加属性的显示与消失
            addDialogVisible: false,
            // 添加参数的表单数据
            addForm: {
                attr_name: '',
                attr_id: ''
            },
            // 添加参数的校验规则
            addFormRules: {
                attr_name: [
                    {
                        required: true,
                        message: '请输入名称', 
                        trigger: 'blur'  
                    },
                    { 
                        min: 1, 
                        max: 10, 
                        message: '长度在 1 到 10 个字符', 
                        trigger: 'blur' 
                    }
                ]
            },
            // 修改参数对话框的显示与隐藏
            editDialogVisible: false,
            // 修改参数的数据
            editForm: {},
            // 修改参数的校验规则
            editFormRules: {
                attr_name: [
                    {
                        required: true,
                        message: '请输入名称', 
                        trigger: 'blur'  
                    },
                    { 
                        min: 1, 
                        max: 10, 
                        message: '长度在 1 到 10 个字符', 
                        trigger: 'blur' 
                    }
                ]
            }
        }
    },
    created() {
        // 获取商品分类列表
        this.getCateList()
    },
    methods: {
        // 获取商品分类列表
        async getCateList() {
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error("获取商品列表失败")
            }
            this.catelist = res.data
            console.log(this.catelist);
        }, 
        // 级联选择框选中项变化，会触发这个函数
        handleChange() {
            this.getParamsData()
        },
        // tab页点击事件的处理函数
        handleTabClick() {
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数列表数据
        async getParamsData() {
            // 证明选中的的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }

            // 证明选中的是三级分类
            console.log(this.selectedCateKeys);

            const {data: res} = await this.$http.get(`categories/${this.caseId}/attributes`,{
                params: {sel: this.activeName}
            })
            if(res.meta.status !== 200) {
                return this.$message.error("获取参数列表失败")
            }
            console.log(res);

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue = ''
            })
            
            if(this.activeName == 'many') {
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 监听关闭参数与属性事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 添加参数与属性
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return 
                const {data: res} = await this.$http.post(`categories/${this.caseId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201) {
                    return this.$message.error("创建失败")
                }
                this.$message.success("创建成功")
                this.getParamsData()
                this.addDialogVisible = false
            })
        },
        // 展示修改的对话框
        async showEditDialog(attr_id) {
           const {data: res} = await this.$http.get(`categories/${this.caseId}/attributes/${attr_id}`,{
                params: {
                    attr_sel: this.activeName  
                }
            })
            console.log(res);
            if(res.meta.status !== 200) {
                return this.$message.error("获取失败")
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 监听修改参数对话框的关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 修改参数与属性
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const {data: res} = await this.$http.put(`categories/${this.caseId}/attributes/${this.editForm.attr_id}`,{
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.activeName
                })
                if(res.meta.status !== 200){
                    this.$message.error("修改失败")
                }
                this.$message.success("修改成功")
                this.getParamsData()
                this.editDialogVisible = false

            })
            this.editDialogVisible = false
        },
        // 删除参数与属性
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)

            if(confirmResult !== 'confirm'){
                return this.$message.info("已取消删除")
            }
            const {data: res} = await this.$http.delete(`categories/${this.caseId}/attributes/${attr_id}`)
            if(res.meta.status !== 200){
                return this.$message.error("删除失败")
            }
            this.$message.success("删除成功")
            this.getParamsData()
            this.editDialogVisible = false
        },
        // 文本框失去焦点，或按下Enter都会触发
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }

            // 如果没有return ,则输入的内容，说明需要做后续处理

            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            
            // 保存操作
            this.saveAttrVals(row)
            
        },
        // 将 attr_vals 的操作，保存到数据库中
        async saveAttrVals(row) {
            // 需要发送请求，保存这次操作
            const {data: res} = await this.$http.put(`categories/${this.caseId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: this.activeName,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error("修改参数项失败")
            }
            this.$message.success("修改参数项成功")
        },
        // 点击按钮让输入文本框消失
        showInput(row) {
            row.inputVisible = true
            
            // 让文本框自动获得焦点
            // $nextTick 方法的做用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应可选tag项
        handleClose(i,row) {
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed: {
        // 如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中三级分类的ID
        caseId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题文本
        titleText() {
            if(this.activeName == 'many') {
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }
}
</script>

<style lang="less" scoped>
.war{
    margin-bottom: 15px;
}
.el-tag{
    margin-left: 15px;
}
.input-new-tag{
    margin-left: 15px;
    width: 120px;
}
.button-new-tag{
    margin-left: 15px;
}
</style>